21 ene 1956 año - 1956 Building (Planning) Regulations Above the permitted height fronting of the street, the building above these levels shall be set back within 76 degrees to the horizontals

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https://www.matec-conferences.org/articles/matecconf/pdf/2016/31/matecconf_iciea2016_13006.pdf
https://global.ctbuh.org/resources/papers/download/2356-genesis-of-a-vertical-city-in-hong-kong.pdf

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